Astronomy General Space Discussion

[CD Xbow]

The Southern Sky Astrophotography exhibition for 2024 has been decided. If you live in sin city you can see the winners in the flesh at the Sydney observatory until 1 February. There are some real beauts.

Galaxies, auroras and a cosmic bat: Southern Sky astrophotography exhibition 2024 – in pictures

The Southern Sky Astrophotography 2024 exhibition displays the top entries from the 20th David Malin awards for Australian astronomers and photographers. The images are on display at the Sydney observatory until 1 February

www.theguardian.com

Unfortunately the Guardian doesn't mention how they were taken, which I find very annoying with any photography competition, even more so with Astrophotography.

 

[MP_]

The Southern Sky Astrophotography exhibition for 2024 has been decided. If you live in sin city you can see the winners in the flesh at the Sydney observatory until 1 February. There are some real beauts.

Galaxies, auroras and a cosmic bat: Southern Sky astrophotography exhibition 2024 – in pictures

The Southern Sky Astrophotography 2024 exhibition displays the top entries from the 20th David Malin awards for Australian astronomers and photographers. The images are on display at the Sydney observatory until 1 February

www.theguardian.com

Unfortunately the Guardian doesn't mention how they were taken, which I find very annoying with any photography competition, even more so with Astrophotography.

Nothing worse than looking at a great picture and not knowing what lens they were using and the settings.

 

[bommer16]

The Southern Sky Astrophotography exhibition for 2024 has been decided. If you live in sin city you can see the winners in the flesh at the Sydney observatory until 1 February. There are some real beauts.

Galaxies, auroras and a cosmic bat: Southern Sky astrophotography exhibition 2024 – in pictures

The Southern Sky Astrophotography 2024 exhibition displays the top entries from the 20th David Malin awards for Australian astronomers and photographers. The images are on display at the Sydney observatory until 1 February

www.theguardian.com

Unfortunately the Guardian doesn't mention how they were taken, which I find very annoying with any photography competition, even more so with Astrophotography.

These pics are amazing. Agree - should have more details.

 

[CD Xbow]

Cosmologists have been forced to 'make stuff up' to explain a number of inconsistencies between their observations and theories. Dark matter and dark energy are the 2 most notable. I have discussed my dislike of dark matter in previous posts and I am a little hopeful the physicists may have found other explanations for the alleged effects that require pixie dust dark matter.

A recent paper suggests we may be able to also bury dark energy as a requirement for cosmic expansion.

'The new evidence supports the "timescape" model of cosmic expansion, which doesn't have a need for dark energy because the differences in stretching light aren't the result of an accelerating Universe but instead a consequence of how we calibrate time and distance.

It takes into account that gravity slows time, so an ideal clock in empty space ticks faster than inside a galaxy.

The model suggests that a clock in the Milky Way would be about 35 per cent slower than the same one at an average position in large cosmic voids, meaning billions more years would have passed in voids. This would in turn allow more expansion of space, making it seem like the expansion is getting faster when such vast empty voids grow to dominate the Universe.'

Research Rejects Dark Energy, Debunks Universe Expansion

One of the biggest mysteries in science – dark energy – doesn't actually exist, according to researchers looking to solve the riddle of how the

www.miragenews.com

Underlying both these issues seems to be a poor understanding of 2 fundamental things which we all experience daily, time and gravity.

Added - I asked one of our silicon friends the following

Q. If the timescape model of dark energy is correct, how might that affect the physical effects that dark matter is used to explain?

'If the timescape model of cosmic expansion is correct, it would fundamentally change our understanding of the universe and the role of dark matter. Here's how it might affect the physical effects attributed to dark matter:

1. Galaxy Rotation Curves: The timescape model suggests that the observed rotation curves of galaxies, which currently imply the presence of dark matter, could instead be explained by variations in the passage of time due to gravitational fields. This means that the need for dark matter to explain these curves would be eliminated.
2. Gravitational Lensing: Similarly, the bending of light around massive objects (gravitational lensing) would not require dark matter to explain the extra mass. Instead, it would be due to the differences in how time passes in regions with varying gravitational strengths.
3. Cosmic Microwave Background (CMB): The patterns observed in the CMB, which are currently interpreted as evidence for dark matter, would need to be re-evaluated under the timescape model. The variations in time and space expansion could account for these patterns without invoking dark matter.
4. Large-Scale Structure: The distribution of galaxies and galaxy clusters across the universe, which is currently attributed to dark matter, would be explained by the uneven expansion of space in the timescape model.

In essence, if the timescape model is correct, it would mean that the phenomena we currently attribute to dark matter are actually due to variations in the way time and space expand in different regions of the universe. This would eliminate the need for dark matter as an explanation and provide a new framework for understanding cosmic expansion.'

The timescape model could kill 2 birds with one stone, wouldn't that be beaut?

 

[CD Xbow]

K2-18b is an exoplanet fairly close to us, at 'only' 124 light years and it has been of interest because of potential 'biosignatures'. It's 2.6 times the size of Earth so it could be a water covered terrestrial type planet, one of the so called super Earths. On the other hand it could be a mini Neptune, one a bit smaller and warmer than which we are familiar. Read about it here.

NASA’s James Webb Telescope discovers life supporting gases on a planet in space - Times of India

NASA's James Webb Space Telescope has detected an exoplanet, K2-18 b, which is larger than Earth and located in a habitable zone. The planet's atmosph

timesofindia.indiatimes.com

There is another possibility, a theoretical Hycean planet, one with large oceans and hydrogen-rich atmospheres. Hycean planets are thought to be common around red dwarf stars, and are considered to be a promising place for life.

 

[GreyCrow]

Do we have the technology and knowledge to retrofit a planet with bio-engineering?

 

[CD Xbow]

Do we have the technology and knowledge to retrofit a planet with bio-engineering?

We have neither the understanding or the technology.